Word definition on your name

definition — перевод на русский

/ˌdɛfɪˈnɪʃən/

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NameError — одна из самых распространенных ошибок в Python. Начинающих она может пугать, но в ней нет ничего сложного. Это ошибка говорит о том, что вы попробовали использовать переменную, которой не существует.

В этом руководстве поговорим об ошибке «NameError name is not defined». Разберем несколько примеров и разберемся, как эту ошибку решать.

NameError возникает в тех случаях, когда вы пытаетесь использовать несуществующие имя переменной или функции.

В Python код запускается сверху вниз. Это значит, что переменную нельзя объявить уже после того, как она была использована. Python просто не будет знать о ее существовании.

Самая распространенная NameError выглядит вот так:

NameError: name 'some_name' is not defined

Разберем частые причина возникновения этой ошибки.

Причина №1: ошибка в написании имени переменной или функции

Для человека достаточно просто сделать опечатку. Также просто для него — найти ее. Но это не настолько просто для Python.

Язык способен интерпретировать только те имена, которые были введены корректно. Именно поэтому важно следить за правильностью ввода всех имен в коде.

Если ошибку не исправить, то возникнет исключение. Возьмем в качестве примера следующий код:

books = ["Near Dark", "The Order", "Where the Crawdads Sing"]
print(boooks)

Он вернет:

Traceback (most recent call last):
  File "main.py", line 3, in 
	print(boooks)
NameError: name 'boooks' is not defined

Для решения проблемы опечатку нужно исправить. Если ввести print(books), то код вернет список книг.

Таким образом при возникновении ошибки с именем в первую очередь нужно проверить, что все имена переменных и функций введены верно.

Причина №2: вызов функции до объявления

Функции должны использоваться после объявления по аналогии с переменными. Это связано с тем, что Python читает код сверху вниз.

Напишем программу, которая вызывает функцию до объявления:

books = ["Near Dark", "The Order", "Where the Crawdads Sing"]

print_books(books)

def print_books(books):
	for b in books:
		print(b)

Код вернет:

Traceback (most recent call last):
  File "main.py", line 3, in 
	print_books(books)
NameError: name 'print_books' is not defined

На 3 строке мы пытаемся вызвать print_books(). Однако эта функция объявляется позже.

Чтобы исправить эту ошибку, нужно перенести функцию выше:

def print_books(books):
	for b in books:
		print(b)

books = ["Near Dark", "The Order", "Where the Crawdads Sing"]

print_books(books)

Причина №3: переменная не объявлена

Программы становятся больше, и порой легко забыть определить переменную. В таком случае возникнет ошибка. Причина в том, что Python не способен работать с необъявленными переменными.

Посмотрим на программу, которая выводит список книг:

Такой код вернет:

Traceback (most recent call last):
  File "main.py", line 1, in 
	for b in books:
NameError: name 'books' is not defined

Переменная books объявлена не была.

Для решения проблемы переменную нужно объявить в коде:

books = ["Near Dark", "The Order", "Where the Crawdads Sing"]

for b in books:
    print(b)

Причина №4: попытка вывести одно слово

Чтобы вывести одно слово, нужно заключить его в двойные скобки. Таким образом мы сообщаем Python, что это строка. Если этого не сделать, язык будет считать, что это часть программы. Рассмотрим такую инструкцию print():

Этот код пытается вывести слово «Books» в консоль. Вместо этого он вернет ошибку:

Traceback (most recent call last):
  File "main.py", line 1, in 
	print(Books)
NameError: name 'Books' is not defined

Python воспринимает «Books» как имя переменной. Для решения проблемы нужно заключить имя в скобки:

Теперь Python знает, что нужно вывести в консоли строку, и код возвращает Books.

Причина №5: объявление переменной вне области видимости

Есть две области видимости переменных: локальная и глобальная. Локальные переменные доступны внутри функций или классов, где они были объявлены. Глобальные переменные доступны во всей программе.

Если попытаться получить доступ к локальной переменной вне ее области видимости, то возникнет ошибка.

Следующий код пытается вывести список книг вместе с их общим количеством:

def print_books():
  books = ["Near Dark", "The Order", "Where the Crawdads Sing"]
  for b in books:
      print(b)

print(len(books))

Код возвращает:

Traceback (most recent call last):
  File "main.py", line 5, in 
	print(len(books))
NameError: name 'books' is not defined

Переменная books была объявлена, но она была объявлена внутри функции print_books(). Это значит, что получить к ней доступ нельзя в остальной части программы.

Для решения этой проблемы нужно объявить переменную в глобальной области видимости:

books = ["Near Dark", "The Order", "Where the Crawdads Sing"]

def print_books():
  for b in books:
      print(b)


print(len(books))

Код выводит название каждой книги из списка books. После этого выводится общее количество книг в списке с помощью метода len().

Last Updated:
30 Mar 2023
— Updated example sentences

Although
the borderline between various linguistic units is not always sharp
and clear, we shall try to define every new term on its first
appearance at once simply and unambiguously, if not always very
rigorously. The approximate definition of the term word
has already been given in the opening page of the book.

The
important point to remember about
definitions
is that they should indicate the most essential characteristic
features of the notion expressed by the term under discussion, the
features by which this notion is distinguished from other similar
notions. For instance, in defining the word one must distinguish it
from other linguistic units, such as the phoneme, the morpheme, or
the word-group. In contrast with a definition, a description
aims at enumerating all the essential features of a notion.

To
make things easier we shall begin by a preliminary description,
illustrating it with some examples.

The
word
may be described as the basic unit of language. Uniting meaning and
form, it is composed of one or more morphemes, each consisting of one
or more spoken sounds or their written representation. Morphemes as
we have already said are also meaningful units but they cannot be
used independently, they are always parts of words whereas words can
be used as a complete utterance (e. g. Listen!).
The
combinations of morphemes within words are subject to certain linking
conditions. When a derivational affix is added a new word is formed,
thus, listen
and
listener
are
different words. In fulfilling different grammatical functions words
may take functional affixes: listen
and
listened
are
different forms of the same word. Different forms of the same word
can be also built analytically with the help of auxiliaries. E.g.:
The
world should listen then as I am listening now (Shelley).

When
used in sentences together with other words they are syntactically
organised. Their freedom of entering into syntactic constructions is
limited by many factors, rules and constraints (e. g.: They
told me this story but
not *They
spoke me this story).

The
definition of every basic notion is a very hard task: the definition
of a word is one of the most difficult in linguistics because the

27

simplest
word has many different aspects. It has a sound form because it is a
certain arrangement of phonemes; it has its morphological structure,
being also a certain arrangement of morphemes; when used in actual
speech, it may occur in different word forms, different syntactic
functions and signal various meanings. Being the central element of
any language system, the word is a sort of focus for the problems of
phonology, lexicology, syntax, morphology and also for some other
sciences that have to deal with language and speech, such as
philosophy and psychology, and probably quite a few other branches of
knowledge. All attempts to characterise the word are necessarily
specific for each domain of science and are therefore considered
one-sided by the representatives of all the other domains and
criticised for incompleteness. The variants of definitions were so
numerous that some authors (A. Rossetti, D.N. Shmelev) collecting
them produced works of impressive scope and bulk.

A
few examples will suffice to show that any definition is conditioned
by the aims and interests of its author.

Thomas
Hobbes (1588-1679),
one
of the great English philosophers, revealed a materialistic approach
to the problem of nomination when he wrote that words are not mere
sounds but names of matter. Three centuries later the great Russian
physiologist I.P. Pavlov (1849-1936)
examined
the word in connection with his studies of the second signal system,
and defined it as a universal signal that can substitute any other
signal from the environment in evoking a response in a human
organism. One of the latest developments of science and engineering
is machine translation. It also deals with words and requires a
rigorous definition for them. It runs as follows: a word is a
sequence of graphemes which can occur between spaces, or the
representation of such a sequence on morphemic level.

Within
the scope of linguistics the word has been defined syntactically,
semantically, phonologically and by combining various approaches.

It
has been syntactically defined for instance as “the minimum
sentence” by H. Sweet and much later by L. Bloomfield as “a
minimum free form”. This last definition, although structural in
orientation, may be said to be, to a certain degree, equivalent to
Sweet’s, as practically it amounts to the same thing: free forms
are later defined as “forms which occur as sentences”.

E.
Sapir takes into consideration the syntactic and semantic aspects
when he calls the word “one of the smallest completely satisfying
bits of isolated ‘meaning’, into which the sentence resolves
itself”. Sapir also points out one more, very important
characteristic of the word, its indivisibility:
“It cannot be cut into without a disturbance of meaning, one or two
other or both of the several parts remaining as a helpless waif on
our hands”. The essence of indivisibility will be clear from a
comparison of the article a
and
the prefix a-
in
a
lion and
alive.
A lion is
a word-group because we can separate its elements and insert other
words between them: a
living lion, a dead lion. Alive is
a word: it is indivisible, i.e. structurally impermeable: nothing can
be inserted between its elements. The morpheme a-
is
not free, is not a word. The

28

situation
becomes more complicated if we cannot be guided by solid spelling.’
“The Oxford English Dictionary», for instance, does not
include the
reciprocal pronouns each
other and
one
another under
separate headings, although
they should certainly be analysed as word-units, not as word-groups
since they have become indivisible: we now say with
each other and
with
one another instead
of the older forms one
with another or
each
with the other.¹

Altogether
is
one word according to its spelling, but how is one to treat all
right, which
is rather a similar combination?

When
discussing the internal cohesion of the word the English linguist
John Lyons points out that it should be discussed in terms of two
criteria “positional
mobility”
and
“un­interrupt­abili­ty”.
To illustrate the first he segments into morphemes the following
sentence:

the
—
boy
—
s
—
walk
—
ed
—
slow
—
ly
—
up
—
the
—
hill

The
sentence may be regarded as a sequence of ten morphemes, which occur
in a particular order relative to one another. There are several
possible changes in this order which yield an acceptable English
sentence:

slow
—
ly
—
the
—
boy
—
s
—
walk
—
ed
—
up
—
the
—
hill
up —
the
—
hill
—
slow
—
ly
—
walk
—
ed
—
the
—
boy
—
s

Yet
under all the permutations certain groups of morphemes behave as
‘blocks’ —
they
occur always together, and in the same order relative to one another.
There is no possibility of the sequence s
—
the
—
boy,
ly —
slow,
ed —
walk.
“One
of the characteristics of the word is that it tends to be internally
stable (in terms of the order of the component morphemes), but
positionally mobile (permutable with other words in the same
sentence)”.²

A
purely semantic treatment will be found in Stephen Ullmann’s
explanation: with him connected discourse, if analysed from the
semantic point of view, “will fall into a certain number of
meaningful segments which are ultimately composed of meaningful
units. These meaningful units are called words.»³

The
semantic-phonological approach may be illustrated by A.H.Gardiner’s
definition: “A word is an articulate sound-symbol in its aspect of
denoting something which is spoken about.»⁴

The
eminent French linguist A. Meillet (1866-1936)
combines
the semantic, phonological and grammatical criteria and advances a
formula which underlies many subsequent definitions, both abroad and
in our country, including the one given in the beginning of this
book: “A word is defined by the association of a particular meaning
with a

¹Sapir
E. Language.
An Introduction to the Study of Speech. London, 1921,
P.
35.

² Lyons,
John. Introduction
to Theoretical Linguistics. Cambridge: Univ. Press, 1969.
P. 203.

³ Ullmann
St. The
Principles of Semantics. Glasgow, 1957.
P.
30.

⁴ Gardiner
A.H. The
Definition of the Word and the Sentence //
The
British Journal of Psychology. 1922.
XII.
P. 355
(quoted
from: Ullmann
St.,
Op.
cit., P. 51).

29

particular
group of sounds capable of a particular grammatical employment.»¹

This
definition does not permit us to distinguish words from phrases
because not only child,
but
a
pretty child as
well are combinations of a particular group of sounds with a
particular meaning capable of a particular grammatical employment.

We
can, nevertheless, accept this formula with some modifications,
adding that a word is the smallest significant unit of a given
language capable of functioning alone and characterised by positional
mobility
within
a sentence, morphological
uninterruptability
and semantic
integrity.²
All these criteria are necessary because they permit us to create a
basis for the oppositions between the word and the phrase, the word
and the phoneme, and the word and the morpheme: their common feature
is that they are all units of the language, their difference lies in
the fact that the phoneme is not significant, and a morpheme cannot
be used as a complete utterance.

Another
reason for this supplement is the widespread scepticism concerning
the subject. It has even become a debatable point whether a word is a
linguistic unit and not an arbitrary segment of speech. This opinion
is put forth by S. Potter, who writes that “unlike a phoneme or a
syllable, a word is not a linguistic unit at all.»³
He calls it a conventional and arbitrary segment of utterance, and
finally adopts the already mentioned
definition of L. Bloomfield. This position is, however, as
we have already mentioned, untenable, and in fact S. Potter himself
makes ample use of the word as a unit in his linguistic analysis.

The
weak point of all the above definitions is that they do not establish
the relationship between language and thought, which is formulated if
we treat the word as a dialectical unity of form and content, in
which the form is the spoken or written expression which calls up a
specific meaning, whereas the content is the meaning rendering the
emotion or the concept in the mind of the speaker which he intends to
convey to his listener.

Summing
up our review of different definitions, we come to the conclusion
that they are bound to be strongly dependent upon the line of
approach, the aim the scholar has in view. For a comprehensive word
theory, therefore, a description seems more appropriate than a
definition.

The
problem of creating a word theory based upon the materialistic
understanding of the relationship between word and thought on the one
hand, and language and society, on the other, has been one of the
most discussed for many years. The efforts of many eminent scholars
such as V.V. Vinogradov, A. I. Smirnitsky, O.S. Akhmanova, M.D.
Stepanova, A.A. Ufimtseva —
to
name but a few, resulted in throwing light

¹Meillet
A. Linguistique
historique et linguistique generate. Paris,
1926.
Vol.
I. P. 30.

² It
might be objected that such words as articles, conjunctions and a few
other words
never occur as sentences, but they are not numerous and could be
collected into a
list of exceptions.

³ See:
Potter
S. Modern
Linguistics. London, 1957.
P.
78.

30

on this problem and achieved a
clear presentation of the word as a basic unit of the language. The
main points may now be summarised.

The
word
is the
fundamental
unit
of language.
It is a dialectical
unity
of form
and
content.
Its content or meaning is not identical to notion, but it may reflect
human notions, and in this sense may be considered as the form of
their existence. Concepts fixed in the meaning of words are formed as
generalised and approximately correct reflections of reality,
therefore in signifying them words reflect reality in their content.

The
acoustic aspect of the word serves to name objects of reality, not to
reflect them. In this sense the word may be regarded as a sign. This
sign, however, is not arbitrary but motivated by the whole process of
its development. That is to say, when a word first comes into
existence it is built out of the elements already available in the
language and according to the existing patterns.

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